System for diagnosing battery cell provided in electric vehicle

Abstract

A system for diagnosing a battery cell using a substrate manufactured by an LDCMOS process, includes a master BMS and a plurality of direct BMSs, wherein a battery cell connection unit included in each direct BMS makes direct contact with a positive electrode terminal and a negative electrode terminal of each of a plurality of battery cells of a battery module to measure raw data of voltages of the plurality of battery cells and raw data of a current of the battery module, and in order to accurately process raw data of the voltages of the plurality of battery cells and raw data of the currents, a first substrate unit manufactured by the LDCMOS process and a second substrate unit including a configuration to wirelessly transmit and receive a signal generated and processed by the first substrate unit to and from the master BMS are provided.

What is claimed is: 
     
       1. A system for diagnosing a battery cell located inside a vehicle, the system comprising:
 a plurality of direct battery management systems (BMSs) located inside the vehicle and electrically connected to a plurality of battery cells included in a battery module; and 
 a master battery management system (BMS) located inside the vehicle and configured to wirelessly communicate with the direct BMSs, 
 wherein the direct BMS includes: 
 a first substrate unit; and a second substrate unit, 
 wherein the first substrate unit includes: 
 a battery cell connection unit including a plurality of ports that physically and electrically come into direct contact with an exposed electrode of each of the plurality of battery cells; 
 a multiplexer (MUX) unit configured to receive analog voltage signals of the plurality of ports of the battery cell connection unit and sequentially output any one of the analogue voltage signals; 
 a voltage dropping unit configured to drop the analog voltage signal output from the MUX unit; 
 a current measurement unit configured to measure a current for all of the plurality of battery cells to generate an analog current signal; 
 a temperature measurement unit configured to generate an analog temperature signal; and 
 a first substrate connection unit configured to receive the analog voltage signal, the analog current signal, and the analog temperature signal to output the analog voltage signal, the analog current signal, and the analog temperature signal to the second substrate unit; and 
 wherein the second substrate unit including a substrate and an element, both operable within a second power range of 5 V or less, converts the received analog voltage signal, analog current signal, and analog temperature signal into digital signals to wirelessly transmit the digital signals to the master BMS; 
 wherein the first substrate unit includes a substrate and an element, each manufactured with a laterally diffused complementary metal oxide semiconductor (LD-CMOS) process and operable within a first power range of 36 V or less, and a level shifter configured to receive power from all of the plurality of battery cells, adjust a level of the received power to a predetermined level or less, and transmit the power with the adjusted voltage to a signal transmission unit and a regulator within the first substrate unit; and 
 wherein the first substrate unit and the second substrate unit are stacked on a single semiconductor chip by a multi-chip package (MCP) process. 
 
     
     
       2. The system of  claim 1 , wherein both a positive electrode terminal and a negative electrode terminal of each of the plurality of battery cells come into direct contact with the ports included in the battery cell connection unit, and
 the voltage measurement unit is connected to each port to measure a voltage for each of the battery cells. 
 
     
     
       3. The system of  claim 1 , wherein the battery cell connection unit includes a current measurement port including a resistor, and
 the current measurement unit measures a current of the battery module based on a result of amplifying a voltage difference between both ends of the resistor, and an amplifier for amplifying the voltage difference adjusts an amplification rate by an automatic gain control unit. 
 
     
     
       4. The system of  claim 1 , wherein the second substrate unit includes:
 a microcontroller unit (MCU); 
 a first wireless communication unit connected to the MCU to wirelessly communicate with the master BMS; and 
 a power supply unit configured to supply power to an element inside the second substrate unit by receiving power from the first substrate unit while lowering a voltage of power of the plurality of battery cells. 
 
     
     
       5. The system of  claim 4 , wherein the first wireless communication unit includes:
 a modem unit including a modem transmission unit configured to perform modulation for transmitting information received from the MCU to the master BMS, and a modem reception unit configured to perform demodulation for transmitting the signal received from the master BMS to the MCU; and 
 a transceiver unit including a Tx unit including a configuration to broadcast the signal modulated by the modem transmission unit through a first antenna unit, and an Rx unit including a configuration to process the signal received through the first antenna unit.